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gabbro

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gabbro

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Olivine gabbro through a polarized microscope. Gabbro is a coarse-grained igneous rock.
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Gabbro through a polarized microscope. Gabbro is an igneous rock which forms in major plutonic intrusions.

Mafic (consisting primarily of dark-coloured crystals) igneous rock formed deep in the Earth's crust. It contains pyroxene and calcium-rich feldspar, and may contain small amounts of olivine and amphibole. Its coarse crystals of dull minerals give it a speckled appearance.

Gabbro is the plutonic version of basalt (that is, derived from magma that has solidified below the Earth's surface), and forms in large, slow-cooling intrusions.



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? Mentioned in ? References in periodicals archive
 
Gabbro forms from molten rock, called magma, that rises out of the mantle and hardens deep within the crust.
Drilling shortcut penetrates Earth's mantle by Monastersky, Richard / Science News
The copper occurs in coarse grained gabbro along the contact of the Coldwell Complex similar to the Marathon Deposit.
Marathon Announces The Purchase Of The Dunlop Property by Business Wire
Beneath the dikes lies a third layer consisting of huge deposits of gabbro rock -- the fossilized remains of ancient magma chambers.
Drilling exposes ocean's underside by Monastersky, Richard / Science News
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